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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ec3343f1acd6afeacde105a03d9117302c94f3e257838c71829acfff67772c' 
  AND token = 'nlmS2sbY5IhdYOcEgzyJ/UUJBJW6W+tS83wtm+ixe8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}